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An Experimental Investigation on Rheological and Heat Transfer Performance of Hybrid Nanolubricant and Its Effect on the Vibration and Noise Characteristics of an Automotive Spark-Ignition Engine
International Journal of Thermophysics ( IF 2.2 ) Pub Date : 2021-01-20 , DOI: 10.1007/s10765-020-02784-8
Bhavin K. Bharath , V. Arul Mozhi Selvan

This research aimed to investigate the feasibility of a new combination of hybrid nanolubricant that can enhance the vibration and noise characteristics of an automotive spark-ignition engine through a comprehensive study of rheological and heat transfer behavior. The ZnO-based mono (ZnO/5W30) and hybrid (ZnO–TiO2/5W30, 50:50) nanolubricants of 0.1 wt% and 0.5 wt% have been prepared, and their rheological behavior was examined by measuring the viscosity at different temperatures ranging from 298.15 K to 338.15 K (25 °C to 65 °C). The results showed that both engine oil and nanolubricant exhibit non-Newtonian behavior. The hybrid nanolubricant presented a comparatively high viscosity index than 5W30 engine oil and mono nanolubricant. The theoretical prediction of thermal conductivity using the Maxwell–Garnetts model showed an increasing trend with nanoparticles’ concentration in hybrid nanolubricant. Experiments were conducted on an unmodified MPFI engine operated under various speeds using regular engine oil and hybrid nanolubricant for investigating noise and vibration characteristics. A significant reduction in longitudinal and lateral vibration accelerations and a maximum decrease of 4.5 % in noise level are observed with hybrid nanolubricant.

Graphic Abstract



中文翻译:

混合纳米润滑剂的流变和传热性能及其对汽车火花点火发动机振动和噪声特性影响的实验研究

这项研究旨在通过对流变和传热行为的全面研究,研究一种新型混合纳米润滑剂的可行性,该混合物可以增强汽车火花点火发动机的振动和噪声特性。ZnO基单晶(ZnO / 5W30)和杂晶(ZnO–TiO 2制备了0.1wt%和0.5wt%的/ 5W30、50:50)纳米润滑剂,并通过测量298.15 K至338.15 K(25°C至65°C)不同温度下的粘度来检查其流变行为。结果表明,机油和纳米润滑剂均表现出非牛顿行为。杂化纳米润滑油的粘度指数比5W30机油和单纳米润滑油高。使用Maxwell-Garnetts模型对导热系数进行的理论预测显示,随着混合纳米润滑剂中纳米粒子浓度的增加,趋势有所增加。使用常规机油和混合纳米润滑剂在未变速的MPFI发动机上进行了实验,这些发动机以各种速度运转,以研究噪音和振动特性。

图形摘要

更新日期:2021-01-20
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